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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a598b0192913426a95c418c8c3d1c71855a11a7f51937ed0ddd8586c0fca896c' 
  AND token = 'mdckuAwiqVvCVRfmJsL+pQrrJaIvGiuKvcrLB21J588=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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