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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8365ac6bead88b6bf6c0d4254bb8b852257b86f96bfeaf4d3cbb5740cc74088d' 
  AND token = 'yssnX8UivNB9eS84jh4P0bsoJ+SC36YIhfbWQeSXTr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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