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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4257ea1c054f09196f1d8eee6b496066c2f43c19d823dd6362e5846c36de406a' 
  AND token = 'dgKrbnETP4WKE//SFLJKh+jt0O9l60A1t+UiU3Me0kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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