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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4daee49aa3ad44f2a340f9570e1044ebd2dffde2e7ef94c2c62608cae8bd4b99' 
  AND token = 'Vv4SCl04R8/qq/0lddioqzhBaNdn6iPDlWexqE8Vz5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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