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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3b5ba9da9bfed199623a0d04bbf1f22b371bc5b05c83777e5b0886b17593d1' 
  AND token = 'yp7et9d10P0A/I28bfI+Q1WIexS8zGg9iw0ohEaETA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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