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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64623c69b18f39c3cdf8fd807e20e42d02e1705e60961fa23a1e335bbe0cd037' 
  AND token = 'AgYr5/kI/WNLhpVWleNPQmH9hC+qfB1QXbF1EG5gLt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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