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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13864d7703c0db793b57dc6dcf32332490ea2e9785b87cee270732d1f85335cf' 
  AND token = 'ZPedCl24j2PqUkPl/8B54oX2MJfN1MXv2Tc3Oj8K+To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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