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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a4430bab075100d51a7a1178b823b37859c4d85296bceb940a573678c0bf53' 
  AND token = '5ipQ/hFEcZe8qPd9ZL+mikxuMd9vh22e1oK06ajfThY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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