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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70791e87177e7900cae3642e476d12ddc83520c2dca385086a33f873e4404b4' 
  AND token = '+4cGQcf+TcI2yclIGjpz6VeTO4d2JrMjSTOJYdI5pT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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