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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee51e7e6462aa45a6bab4898ccb87f6cfbfc889bb7332625a1b9c8431efbea17' 
  AND token = 'ngm2+EJwdNeyT8n2XIIJhX7vb65mTGpyIjREQ7jTA6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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