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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68928e3787723490d2bf6ff0f899ebd67f2167e690a15e07bc53dfae803651a6' 
  AND token = 'mhl3jvG5X5P8sFhlw55A8UXX2c1YR/FxEIoGrFnXUjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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