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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8208c65f1e806f450969ef8bcd0f7a5370e2c863bb1dee3f08fb0b74a983f3d6' 
  AND token = 'Wdil+sSOR5xFEXtBhuLeulEmPu+cQUxnVW4pfPAetRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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