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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cce0c5b450d777613ae38e9140cb6c13dab3eadaecea7dfc9ed51b44d04d0b5' 
  AND token = '+Lo/WsWKfgMl+eI6PzPMLUqbfQ/65Esm0hv45nYco4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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