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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611ed594f316d9d2322d76b478a453ceabb572423eb44b8b08cc9c99c049f5f9' 
  AND token = 'MICEpscYN/qTJsMzjavd45juSRZ9ubokSXQho5v1XkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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