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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27dcc30d7cc1ca4ab71d3c1939624585e7ace9b0e9c9539d0b8b3f251676656' 
  AND token = 'Px2YbYYcWN0joA0BC+KiwcxwXx7xBLoelQ5fV75Q+k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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