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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbe01b74343608931a445238fc7981c90b5e0c6fc1ad7ebfeec0862eec0f9b9' 
  AND token = 'NNJsvj/YtAjMeDM2Ym34ubrbOpDVVMc9PPJmJ/qmqhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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