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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd79e01f743f5a5d65aec33667e48eed2e5ffae0f816fc35ad5228b5a5dedf1f' 
  AND token = 'rshtm18UdCRw5oU7k7ss5hRTrJrXbNNddZwF6CuWahc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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