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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa303bf46d76ff44fac7e4b5940814250250ddbb6f4b61825269776841e1bda' 
  AND token = '3OzGToUi87nAMcod1cE12KJS3h0UAR8LOazczaXh0WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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