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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9d15e4eba8e93b00d4cd42d5bdc231add070eb37122ef021fe382b08a29b21' 
  AND token = 'miuCg7NancPY5MJJSIIhHGX/QaJnjvvYEoqpxB3Qwfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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