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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c4945e3b9b23163c8425414f735369b7a50879cd1cafe3174f152280720228' 
  AND token = 'NsTypg2WE4p2tYhVUtS8xKzNhP0TApORkbMM3+Uh0Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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