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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda9347bb9e309577ee9d081977522093d050f69c8b3190ecce68c645a5df531' 
  AND token = 'QQtDi//NQtbVgCwchIlGIkQIxnCxcopNmrCJT9FnoRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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