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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e6009ca53dc264c7951a919d38e8e9b5158ee5c2e474f323618dcd869a5ff7' 
  AND token = 'PG/tT7iQl2sYd20ucTK55iuzmX8DHHNW/bPTV3SURaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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