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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233b8d883590b823af757698979c54c7051e4e85962457b3222b273bd23a643c' 
  AND token = 'Q1MTOMmqkzz01nJwHYBvN7wxvvn5w1QGi3L2y28//6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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