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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb918eeb7e5f800c028acc310f055ee8e944cc8a03fd7590d185ee515650ff29' 
  AND token = '5PrSiauaQ6/bpIC5kELFIl6aidjbZX9M5doKW8yOOdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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