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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9acdf9c6dfd2ad0eb45e724d5af74ced28cf01e6c56015f84666a8c231919823' 
  AND token = 'hCq2BatzznCQlt+EE8nC3ru1am9GIYOBlSCi/U3QPfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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