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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8831536ba79732af05628ae004535efdda7b0acfa01ac5f66761104a569381a' 
  AND token = 'F8W/Zzw5BdjVdg4K6taQdMOUFrJOtdHQCZwkXxRMRVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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