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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bce70a8cfde5ea520c9abdded08b12fe91721562304bb274b8b5b20a6c83252' 
  AND token = 'RswnPQqWof+4QxPWSis9rb9ruTuq+1U4jxWdi2zkokM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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