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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968384800ac7e5780732ab83a7d4f3e108059691737c2f089aa861c0efec37cf' 
  AND token = 'QrI9srfuc2T2xGU2O//YOiOMuBj0BYQ1bXNBYjez2oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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