SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fb1a7577c639feab4db797fe84cb05560ddb47f463b705cfcaa6c62deb1589' 
  AND token = 'lBHezolrjct+IB/za2ZUxywcQ3shqWKnfBNu45Fk02Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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