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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71061fa4ae285dc7f811c079a4a67f2b1608eb604a8796abfeddf6e4e6b3162' 
  AND token = 'S0cZH6XqeqQPfHgBeQMP5ZfwmC3SQJf1mxavvtgshl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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