SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e54c77a2edf457144e1247e71aa1f895d4039d9ff2a8ba4293318e870bb5ee' 
  AND token = 'eEsJZZUZOgLG7G2VVmrP1lwhOE2TPKghgEvnw/5fvP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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