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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb4a219b7960972f976745256233905baffbfd2e705b7cc359a8953ce33cf5a' 
  AND token = 'u9jZ58mFayqv2Wy3bdZ0MWsbh/roE/SisM///AKRjN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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