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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025cb77e901cbd39051ae74580bcae346c06c8776ef220ab5bfe5d719a1c205e' 
  AND token = 'SBskwp3PeE6JbI+vVrysRCP0AIywp2OJtQl6TE5icns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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