SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3199ab57d5ebc9d211b2c2676ea18d40f92db89bfb62f92f5c028c27a0032e4a' 
  AND token = '8Jfg8OFZ0YbH2Hg+eQNfGlChXWQjARnugzjB7ifljXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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