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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38fdc3d0f0b077d8dbb76359b7f12979f0f956aabfd17081ff85c4950f8f85b0' 
  AND token = 'tOJJg3Z930flvvm+RmLO8Amr6kQE57TyxOZUmT2nbmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}