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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf445a31eb8ce364a5609d7c3d2f416ea3a301f045b0c806fd685a1d2abbe7d' 
  AND token = 'eGZTNVzaDN9yKQOKkCrMoZwxEb/E4ZmZ+wwNzDK178U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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