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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc64fdba19aac32e6ea14429c76ecac3b3aa61a1fcad9786353b7a38895718e' 
  AND token = 'cqoJt11ss/UlWtEiVQfSD1WuhYNaOWYq9PUwndHkDJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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