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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb6e708f1dbc4948d4d053319794f529312b74eae60c5ec5534e2f30192364e' 
  AND token = 'yE0rAkW5HdthBAFrZykSgpf2t1h03HRaP0V4sQkkKpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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