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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f452f47fa6859877668437f834c384a504c4c152906141890fab96597de6171' 
  AND token = 'VYp0+r9DEdz+SeaaocWDsq22lbw1yu1Gh0+5G0iWFgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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