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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c184f93e5f7fae1e55aebe3a3d420fae0c7bd6ae975c14880334cb62bf042254' 
  AND token = '6SVfNm0FOiCSLa181ln5GiSBIAjN83MJflxYtCu69SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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