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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f5eeeb3f64a6a61ed628a8532e4d5ca57b7e71821189095fe4c7e4e9a01624' 
  AND token = 'hOqzRuVZ+PjOcCz3BJNGPXk2ejmOmCbc7M7nZbOB7e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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