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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4466dd0df4bfe39206d5d135c715c0c089567a703a357f4ab56f31eb664026' 
  AND token = '+Yi+gP9bVA71evHdNce4WKBeRE9ZEGEkqs8j/iAhcvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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