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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae193d5c61dae29f1826973d4bcce5e3c07cdaefce4c23204fc02008f4a4652' 
  AND token = 'pwda64Mhw3bp8RFWGWKZUA5vKz345v/zqMSyh63kxsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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