SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974e2a68db38f6aabec33b75de247bf825ad490f1808bf50fbf936149b623e80' 
  AND token = 'zOFeGxe22ijMOeYhIb0w5qs9PvmvVxll8ZLwwugdhZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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