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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fb919b2d1140948ec6349f101a70eb8aca21e03d74cd1b1466b19d7ac82d0b' 
  AND token = 'SHC4BGId1J8lF75vQBFc5HpOhdxr0JeUeZfxPx73Sdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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