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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b5e1e5bb949f4c1d379f3450af26e44958e0cca49c953145badd2124a1482e' 
  AND token = 'j7X7r1Eq8osfQkrgDttx5W0YZe3kukirl1TNY876Mks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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