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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8cefe878effb9bc285a920bb5fc2d1a4fa08d191638ca3aea33516709ec53a' 
  AND token = '8x5lL9AyRq7d62Vs5YYkwZRmHkT/7PgJ8VP+jO+jfOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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