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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8c36ca0ed274db36efb94e181d7f5422c0e17f93e441d9c60ec3b3f03a5aa8' 
  AND token = 'OIijgqGSVuaQF6JFXS7+7Mhvm3jsKtev9Teh5a/0TW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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