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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb0089b5ebefbdd72972a033461528e37bd46dd2dcb4274a7efb7478311d718' 
  AND token = 'zY2I2VTKBQO5IzIXrO3s2G0+qgVQCM1kDdt2m/juAr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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